Improvement in steam-generators



E. P. DO YENQ Improvement in. Steam Generators.

Patentedlune 20,1871.

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ERASMUS P. DOYEN, (in PORTLAND, MAINE.

IMPROVEMENT lN STEAM-GENERATORS.

Specification forming part of Letters Patent No. 116,167, dated June 20,1871.

To all whom it may concern:

Be it known that I, ERASMUS P.'DOYEN,

' of Portland, in the county of Cumberland and State of Maine, haveinvented a new and valuable Improvement in Steam-Generators and I dohereby declare thatthe following is a full, clear, and exact descriptionof the construction and operation of the same, reference being had tothe annexed drawing making apart of this specification and to theletters and figures of reference marked thereon.

Figure 1 of the drawing is a representation of a vertical section of myinvention. Fig. 2 is a horizontal section of the same.

My invention has relation to an improvement in the construction ofsectional steamgenerators 5 and it consists in the construction andnovel arrangement of the hollow grate-bars communicating with thewater-tubes, whereby a rapid generation of steam is effected. In theaccompanying drawing illustrating this invention a single section of thegenerator is represented. Each section consists of a number of uprighttubes connecting a semicircular steam-chamber with an arched tube,forming a portion of the top of the fire-box, and communicating at eachend with the horizontal hollow grate-bars.

The letter A of the drawing designates the upright tubes. B representsthe semicular cup or steam-chamber. (l designates the arched tubeforming a portion of the top of the firebox. The ends of this tubeterminate in the short cylinders or corner chambers D, which areconnected by the hollow bars E of the watergrate. The cylinders D arelarger in vertical diameter than the bars E, and the latter are soarranged that the base line or floor of each hollow bar shall be higherthan the bottom of the cylinders D, the object being to provide for theaccumulation of sediment at a point whence it can be readily removed.

Usually it is found convenient, in practice,

to provide each section with two hollow gratebars. More may be employed,if it is thought necessary; or, if the generator be of small size, oneonly may be convenient. In casting, care should be taken to leavesuflicient space between the ends of the cylinders D and the outer sidesof the bars, to prevent the sections.

said bars from coming in contactwhen the sections are fitted together.half the width desired between the grate-bars.

F F represent hollow shoulders, extending upward from the cylinder D oneach side of each end of the arched tube 0, thus forming on the innerside of each end of said tube a plane surface, which is a section of thelateral Wall of the fire-box, and is designed to .fit accurately to thesame portions of the adjoining In this manner a complete fire-boxis'formed by fitting the sections together, the same being provided withcontinuous lateral walls, hollow water-grate, and arched top, therebeing spaces between the tubing forming the arched'top for the passageupward of the heated products of combustion. D represents the openingsin the faces of the semi;

This space should be D, through which communication is established withthe drums of the adjoining sections.

When a sufficient number of these sections is joined to make a boiler ofthe size required the sections are all secured together, in a strong anddurable manner, by means of a bolt passing from end to end through themiddle openings d in the sides of the arched tube G. The upright tubes AA are laterally connected by the partial walls a a, which extend upwardfrom the arched tube 0 to near the steam-chamber, where they end, eachleaving a space for the passage of the heated products of combusshoulderF, mud-drums D, and water-grate E, In testimony that I claim the above Ihave substantially as specified. hereunto subscribed my nalne in thepresence 2. The combination, with a sectional casting, of two witnesses.

comprising the steam-chamber B, water-tubes ERASMUS P. DOYEN.

A C, fire-box shoulder F, and mud-drums D, Witnesses:

of the hollow grate-bars E, substantially as Jos. A. LOGKE,

specified. 4 AM. Amos.

